Question: Q9. Prove that: cot 4x(sin 5x + sin 3x) = cotx (sin 5x - sin 3x) Q10. Show that sin-13-sin-1 = 84 17 85

Q9. Prove that: cot 4x(sin 5x + sin 3x) = cotx (sin

Q9. Prove that: cot 4x(sin 5x + sin 3x) = cotx (sin 5x - sin 3x) Q10. Show that sin-13-sin-1 = 84 17 85

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